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Full text of "The Flow Of Gases In Furnaces"

DESIGN OF OPEN-HEARTH FURNACES
TABLE 18

267


	Gas Checker
	Air Checker

A checkerwork height has been assumed, in order to illustrate the effect of a high checkerwork. On this basis: The number of passes required will be determined by dividing the lineal amount of pass required by the height of checkerwork: n for gas =4763 -f-7 . 00 = ..................
	681
	

n for air =8361 -=-7. 00= ...................
	
	1195

Any desired length or width of chamber that will contain the number of passes may be selected. When a square pass is used, it is necessary that the chamber dimensions should be multiples of the pass dimension, plus one wall. The length of both chambers will be alike. Let n = number of passes in length of chamber, then Z = 190n+63. Assume n =40, then the length of the chamber will be: 190X40+63=             .....
	7 m 663
	25 14 ft

For the width of the chambers, n may be assumed as some number which will give a number of passes slightly in excess of that computed above.    For the case in hand, let n = 18 for gas and 30 for air.    The corrected number of passes will be, therefore: 40X 18 for gas = ..........
	720
	

40X 30 for air == ...................
	
	1200

The width of the chambers required will be : For gas- 190X18+63 =
	3 m 483
	

For air:  190X30+63 = ....................
	
	5m 763

The area occupied by the checkerwork will be: For gas: 7.663X3.483= .................
	11.425ft 26 m2 69
	18.90ft

For air: 7.663X5.763= ...................
	
	44 m2 16

The corrected checkerwork volume will be: For gas: 26.69X7 00= ...............
	287. 4 sq ft 186 m3 83
	475. 4 sq ft

For air: 44.16X7.00= .................
	
	309 m3 12


	6602 cu ft
	10,916 cu ft